Brick pan for boilers



April 13-, 1943. B. LABARE:

BRICK PAN FOR BOILERS Filed A11g. 15, 1941 Sheets-Sheet l INVENTORLabaree ATTORNEY Begbmz'n April 13, 1943. B. LABAREE' BRICK PAN FORBOILERS Filed Aug. 15, 1941 Sheets-Sheet 2 INVENTOR flery'amin 461117078??? BY 1? 'ATTRNEY 5 Patented Apr. 13, 1943 UNITED srrs BRICKPAN FOR BGHIERS 7 Benjamin Labaree, Philadelphia, Pa, assignor to EdwardG. Budd Manufacturing Company, Philadelphia, Fa a corporation ofPennsylvania Applicationhugust 15, 1941, Serial No. 407,020

4 Claims.

The invention refers to a supporting structure for fire bricks which arearranged below the burners of steam boilers. Such supporting structuresare generally called brick pans.

An object of the invention is a brick pan which is unusually light andyet strong so that, when used for a boiler of a ship, the payload can beincreased correspondingly to the saving of weight for the brick pan.

An object of the invention is also a brick pan which is gas-tight sothat it may form part of the boiler enclosure.

Another object of the invention is a brick pan which, except whendamaged by an outer force, does not require maintenance Work or repairsand which has an extremely long life, in fact a life equal to orsurpassing the life of the boiler proper or of the ship in which it isused. These objects are of great importance in structures such as shipswhere the brick pan is not accessible at all or at least where it isdifiicult to reach certain parts thereof. Said objects are furthermoreextremely important for ships such as destroyers which may be laid, upin peace time for many years but which should be capable of being takeninto use at any moment in the case of an emergency with the very minimumof time for recon ditioning.

The objects of the invention are largely achieved by making the entirebrick pan of stainless steel such as austenitic stainless steel havingfor instance, 18% chrominum and 8% nickel, the strength of which ismaterially increased or even doubled by cold work, and by uniting themembers of the pan by a spot welding procedure which does notdeleteriously interfere with the corrosion resistance and the cold-workstren of the material.

The objects of the invention are furthermore achieved by the use ofbox-section main girders or beams which are interconnected by acontinuous panel forming thesupport proper for the bricks and by spacedreinforcing rails or braces, all said elements being united such as byspot welding into one integral structure.

Further objects, advantages, and features of the invention will becomeapparent from the embodiment which is illustrated in the attacheddrawings and described in the following.

In the drawings;

Figure 1 is a diagrammatic vertical transverse section through a boilerstructure with a brick pan according to the invention;

Figure 2 is a perspective View of "one section of the brick pan on alarger scale than Figure "1;

beams 29 are sheet metal panels 32 Figure 3 is a fragmentary sectionthrough the brick pan as shown in Figure 1 but on a still larger scale;

Figure 4 is a fragmentary section inthe plane of line l-4 of Figure 2;

Figure 5 is a perspective fragmentary view of a corner portion of one ofthe main supporting beams. v

The boiler illustrated in Figure 1 comprises two upper drums 5, 6',three lower drums l, 8 and 9; and several banks of boiler tubes l0, l lI 2, l3 and It. The burners are arranged in the space between the tubesH and I2 and between the tubes l3 and l4. i5 is a space for so-calleclecono-' mizer tubes.

The entire structure so far described is enclosed by a double Walledstructure 16, IT and [8 and'by the brick pan structure [9. The latter isarranged between the lower drums l and 8.

The brick pan comprises several sections one of which is shown in Figure2. The sections are arranged side by side in the direction perpendicular to the plane of Figure l and are connected to one another alongtheir meeting margins.

Each brick pan section comprises three main supporting beams 20 whichare arranged parallel to and spaced from each other and from thetransverse side margins of th section. Each beam 20 consists of achannel having a bottom Wall 2 I side walls 22, marginal flang 23, andof a cover plate 24 which overlaps and is fastened, such as by spotwelding, to the flanges 23. At the points where the beams 20 are bent,the walls 22 and the flanges 23 are transversely cut and the gap at thecorner is closed and the corner itself reinforced by bracket plates 25and their flanged portions '26. The plates 25, 28 are weldedrespectively to the side walls 22 and to the cover strip 2d. i

Arranged transversely to the beams 20 are Z- section rails 27 having aweb 28 and and arms 29 and 30. Angle bracket plates 3i connect the endsof rails 27 to beams 25, having one of their arms fastened to one end ofa web 28 and the other arm to the adjacent portion of a beam wall 22.The arms 29 of rails 21 are arranged in one plane with the adjacentportions of the bottom walls 2! of the beams 29.

Fastened, such as byspot welding, to the arms 29 of the rails 27 and thebottom walls 2! of the Each panel 32 is of such a width as to extendfrom one beam 20 to the next or to theadjacent lateral margin of thestructure. The different panels 32 overlap eachother at 33 in the regionof the beam 20', the

side edge of one Of the adjacent sheets 32 being for this purposeoutwardly offset as shown in Figures 2 and 4.

The lateral outenmargins of the panels or sheets 32 are reinforced byangle section strips or beams 34. Brackets 35 have one of their armswelded to the free arm of the beam 34 and a bent-off tongue 36 connectsto the adjacent outer end of the rails 27. Holes 31 in the beams 34serve for connecting adjoining brick pan sections to one another or toan end wall of the boiler casing by means of screw bolts, rivets or thelike.

The side margins of the panel sections are reinforced by flat strips 38and are likewise provided with holes 39. These holes 39 serve for theattachment of the pan to brackets 40 which may be welded to the drums Iand 8.

4| are ridges welded to the lower portion oi the pan structure whichserve to hold the inclined parts of the brick lining 42.

All the parts of the described brick pan section are Welded to oneanother by spot welding in such a manner that the corrosion resistanceand the strength of the material are not adversely aifected.

The experience so far gained has proven that with the new structure, allthe objects are achieved which have been outlined in the preamble ofthis specification. It is believed that structures built in accordancewith the invention will stay serviceable for an unlimited length of timein view of the fact that the material used austenitic stainless steel ofthe so-called 18-8 type-is practically incorrodible by the agents towhich they may be subjected, due to the fact that the corrosionresistance and the cold-work strength of the material is not impaired bythe welding process, and due to the fact that the brick lining preventsany heat which might adversely influence the material, from reaching thepan proper.

Although one embodiment only of the invention has been illustrated anddescribed, it is obvious that anybody skilled in the art may designminor changes or adapt the form of the pan to the specific requirementsof different boilers without departing from the spirit of the invention.Certain boilers, for instance, make it advantageous to arrange thebox-section beams longitudinally and the Z- or angle section railstransversely. All such modifications and adaptations of the inventionare intended to be covered by the appended claims.

What is claimed is:

1. A sheet metal brick pan sub-assembly unit capable of being handledand shipped as a unit and having its margins formed with reinforcedjoint structures for assembly with adjacent parts of a boiler casing,said unit comprising longitudinal beams, transverse rails and a coverpanel, all fabricated out of light gauge sheet metal, said longitudinalbeams being of hollow cross-section and extending continuously from endto end of the unit in parallel relation spaced from each other, saidtransverse rails being of angular cross section and small crosssectional area as compared with said beams and being disposed normal tothe beams with one of their arms in substantially the plane of the innerwalls of said beams and being arranged in parallel relation spaced fromeach other, another arm of said rails being joined to the adjacent sidewall of a beam, and the cover panel overlapping the inner walls of saidbeams and the first-named arms of said rails throughout their extent andbeing joined thereto substantially throughout the overlap, whereby anintegrated structure results in which the parts mutually reinforce andbrace each other thereby combining great strength and rigidity with lowweight.

2. A brick pan section for boilers fabricated of light-gauge sheetmetal, comprising a generally rectangular elongated structure as seen inplan and having parts thereof extending in different planes in thedirection of its length, the section comprising a light-gauge metalpanel extending over its entire inner face, spaced parallellongitudinally extending hollow section beams extending continuously thelength of the section and overlapping said panel through one of theirwalls and secured thereto in the overlap, angular reinforcing andattaching members extending the length of the panel and secured throughone of their arms to the side margins of the panel, and longitudinallyspaced stiffening members of angular section and of materially lessdepth than said hollow beams having one of their arms overlapping thepanel and secured thereto in the overlap, said stifiening membersextending between the hollow beams and between the beams and the angularattaching members, and brackets joining each end of each of saidstifiening members to one of said hollow beams or attaching members, thesection so fabricated being strong and rigid with the parts mutuallystrengthening and bracing each other to render it Well fitted forprolonged use and capable of being handled and shipped as a unit.

3. A light weight unitary sheet metal brick pan section capable of beinghandled and shipped as a unit comprising longitudinal beams, transverserails and a cover panel all fabricated out of light gauge sheet metal,said longitudinal beams being of closed box-section and extendingcontinuously from end to end of said section and being disposed inspaced parallel relation with respect to each other, said railsextending normally to said beams, being of angular section and beingalso disposed in spaced parallel relation to each other and being of adepth substantially less than the beams, one arm of said angular sectionrails being disposed in substantially the same plane as the inner wallof the adjacent-section of a beam, and another arm being connected tothe adjacent side wall of the beam, and the cover panel being connectedto the inner walls of said beams and to the first-named arms of saidangular section rails substantially throughout the lengths of said beamsand said rails, all the connections being by spot welding to avoidweakening the structure but to integrate it into a structure in whichthe parts mutually reinforce and brace each other, thereby combininggreat rigidity and strength with low weight.

4. A brick pan structure of sheet metal for boilers or the like having adepressed generally horizontal central portion and inclined sideportions and comprising longitudinal beams, transverse rails and a coverpanel, said beams being arranged parallel to but spaced from each otherand extending continuously from end to end of the structure, the railsbeing of angular section and also arranged parallel to but spaced apartfrom each other and of a depth substantially less than the depth of thebeams, one of the arms of said rails being arranged insubstantially theplane of the upper wall of the adjacent section of a beam and anotherarm of the rails being connected to the adjacent side wall of a beam,the cover panel being connected to the upper walls of said beams and tothe firstnamed arms of the rails substantially throughout the length ofthe beams and the rails, the beams being each comprised of a channelmemher having its bottom wall secured to the panel and having lateralflanges from its side walls, said side walls and lateral flanges beingcut at the points where the central portion of the structure merges withthe inclined side portions,

BENJAMIN LABAREE.

